Carrier 58MVP Troubleshooting Manual

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Carrier 58MVP Troubleshooting Manual Manual pdf 1 page image

58MVPVariable-Speed 2-StageElectronic Condensing FurnaceTroubleshooting GuideNOTE: Read the entire instruction manual before starting theinstallation.SAFETY CONSIDERATIONSINDEXPAGEInstructions .....................................................................................1Example ..........................................................................................2Sequence of Operation................................................................1-5Self-Test Mode..........................................................................2Heating Mode............................................................................2Heating Mode-Two Stage.........................................................2Emergency Heat Mode..........................................................2-3Cooling Mode ...........................................................................3Heat Pump Mode...................................................................3-4Continuous Fan Mode ..............................................................4Component Test.....................................................................4-5Bypass Humidifier Mode..........................................................5Dehumidification Mode ............................................................5Zone Mode ................................................................................5Start Here........................................................................................6Service Label/Fault Code Instructions .......................................7-8Improper Operation With No Flashing Fault Code ......................9Not Enough Cooling Airflow ......................................................10High-Fire Temperature Rise Too Low (Cold Blow) ..................11LEDs 1, 2, 3, or 4 On Solid...................................................11-12RED LED2 Flashing ....................................................................12Fault Code 11—No Fault in Recent History Display ................13Fault Code 12—Blower Calibration Lockout........................13-15Fault Code 13—Limit Switch Lockout..................................15-16Fault Code 14—Ignition Lockout................................................17Fault Code 21—Invalid Model Selection....................................17Fault Code 22—Set Up Error......................................................18Fault Code 23—Invalid Blower Airflow Selection ....................18Fault Code 24—Secondary Voltage Fuse Is Open................19-20Fault Code 31—High-Pressure Switch Fault.........................21-22Fault Code 32—Low-Pressure Switch Fault .........................23-24Fault Code 33—Limit Switch Fault.......................................24-25Fault Code 34—Ignition Proving Fault .................................26-27Fault Code 41—Blower Outside Valid Speed Range ...........27-28Fault Code 42—Inducer Outside Valid Speed Range...........29-30Fault Code 43—Pressure Switch Calibration Fault...............30-31Fault Code 44—Blower Calibration Fault ..................................32Cleanup and Start-Up Instructions ..............................................33APPENDIX A—Board Layout & Wiring Schematic ...........34-35APPENDIX B—Isolation Circuits ..............................................36APPENDIX C—Pressure Check Diagram ..................................36APPENDIX D—Quick Motor Test Procedure ......................37-39APPENDIX E—Variable-Speed Condensing Furnace Duct Staticand Blower Operation.............................................................40-44APPENDIX F—Quick Reference Information ...........................45APPENDIX G—Thermostat Staging Algorithm ...................46-47INSTRUCTIONSThis guide uses your expertise and observations to lead you to thetrouble spot as efficiently as possible. This is only intended as aguide and should not be used blindly. Your experience andexpertise are of high value when troubleshooting this unit. Do notdisregard all of your instincts.The microprocessor furnace control was designed with diagnosticcapabilities built in. LEDs are used to flash a fault code which willlead you to 1 of the subsections as listed in the Index.You should ALWAYS begin in the START HERE subsection(see Index for page number) which will guide you to theappropriate subsection where a minimal number of steps will beused to correct the problem. If you are very experienced at howthis furnace operates and you suspect the problem is either theblower motor, inducer motor, or furnace control board, you can usethe quick motor test procedure at the end of the troubleshootingguide to isolate the problem or direct you to appropriate section inmain troubleshooting guide.Once in a subsection, read the statement or question. A statementwill have a number in the "GO TO" column. Do whatever thestatement says, then proceed to step indicated in the "GO TO"column.If the step is a question (a question will have a number in the"YES" or "NO" column), answer it "YES" or "NO." If the answeris "YES," go to step indicated in "YES" column. If the answer is"NO," go to step indicated in "NO" column.Let’s try our guide out using the EXAMPLE section below, andsee how it works. Suppose that the problem is a defectivelow-pressure switch (for example will not make). This is aninternal problem and cannot simply be seen. We go to the STARTHERE section to Step 1.Additional Service Tools are available for current variable speedcondensing furnaces. The Advanced Product Monitor KitKGAFP0101APM includes a harness and diskette that allowscommunication with the control board through a personal com-puter (RS-485 adapter required). The ICM Motor Simulator KitKGASD0101FMS is a plug-in device to help trooubleshoot ICMinducer and blower motors and control boards. Reference pricepages for current kit numbers.SEQUENCE OF OPERATIONFurnace control must be grounded for proper operation, orcontrol will lock out. Control is grounded through green wirerouted to gas valve and burner box screw.Using schematic diagram (see Appendix A), follow sequence ofoperation through different modes. This furnace has a new controlsystem. Read and follow wiring diagram carefully.NOTE: If 115-v power supply to furnace or blower access panelswitch is interrupted during a call for heat, blower operates atlow-heat speed for 60 sec when power is restored before heatingcycle is resumed.Visit www.carrier.comManufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.Book 1 4Tab 6a 8a PC 101 Catalog No. 535-754 Printed in U.S.A. Form 58MVP-8SM Pg 1 9-99 Replaces: 58MVP-6SM